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Remove wall-time / unused skip tick protection (#11412)

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Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
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GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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25
patches/server/0722-Add-EntityPortalReadyEvent.patch Normal file
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@ -0,0 +1,25 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 12 May 2021 04:30:42 -0700
Subject: [PATCH] Add EntityPortalReadyEvent
diff --git a/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java b/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
index e2969b49494c55c3705312361ee8083b05ef569e..417a9ab28d247d5fbb3f1097fdeccab7ad2a793b 100644
--- a/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
@@ -133,6 +133,14 @@ public class NetherPortalBlock extends Block implements Portal {
// CraftBukkit start
ResourceKey<Level> resourcekey = world.getTypeKey() == LevelStem.NETHER ? Level.OVERWORLD : Level.NETHER;
ServerLevel worldserver1 = world.getServer().getLevel(resourcekey);
+ // Paper start - Add EntityPortalReadyEvent
+ io.papermc.paper.event.entity.EntityPortalReadyEvent portalReadyEvent = new io.papermc.paper.event.entity.EntityPortalReadyEvent(entity.getBukkitEntity(), worldserver1 == null ? null : worldserver1.getWorld(), org.bukkit.PortalType.NETHER);
+ if (!portalReadyEvent.callEvent()) {
+ entity.portalProcess = null;
+ return null;
+ }
+ worldserver1 = portalReadyEvent.getTargetWorld() == null ? null : ((org.bukkit.craftbukkit.CraftWorld) portalReadyEvent.getTargetWorld()).getHandle();
+ // Paper end - Add EntityPortalReadyEvent
if (worldserver1 == null) {
return new DimensionTransition(PlayerTeleportEvent.TeleportCause.NETHER_PORTAL); // always fire event in case plugins wish to change it